Prefer text fields in technical-form AI and add invoice payment methods.

Co-authored-by: Cursor <cursoragent@cursor.com>

database/migrations/096_invoice_payment_methods.sql

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+-- Meshkee CMS — invoice / template payment methods (نحوه ی پرداخت)
+
+-- ---------------------------------------------------------------------------
+-- template payment methods (duplicatable free-text)
+-- ---------------------------------------------------------------------------
+CREATE TABLE invoice_template_payment_methods (
+  id           BIGINT GENERATED BY DEFAULT AS IDENTITY PRIMARY KEY,
+  template_id  BIGINT NOT NULL,
+  text         TEXT NOT NULL,
+  sort_order   INT NOT NULL DEFAULT 0,
+  created_at   TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+  updated_at   TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+
+  CONSTRAINT invoice_template_payment_methods_template_id_fkey
+    FOREIGN KEY (template_id) REFERENCES invoice_templates (id) ON DELETE CASCADE,
+  CONSTRAINT invoice_template_payment_methods_text_nonempty
+    CHECK (char_length(trim(text)) > 0)
+);
+
+CREATE INDEX idx_invoice_template_payment_methods_template_id
+  ON invoice_template_payment_methods (template_id, sort_order);
+
+CREATE TRIGGER invoice_template_payment_methods_set_updated_at
+  BEFORE UPDATE ON invoice_template_payment_methods
+  FOR EACH ROW
+  EXECUTE FUNCTION set_updated_at();
+
+-- ---------------------------------------------------------------------------
+-- invoice payment methods (duplicatable free-text)
+-- ---------------------------------------------------------------------------
+CREATE TABLE invoice_payment_methods (
+  id           BIGINT GENERATED BY DEFAULT AS IDENTITY PRIMARY KEY,
+  invoice_id   BIGINT NOT NULL,
+  text         TEXT NOT NULL,
+  sort_order   INT NOT NULL DEFAULT 0,
+  created_at   TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+  updated_at   TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+
+  CONSTRAINT invoice_payment_methods_invoice_id_fkey
+    FOREIGN KEY (invoice_id) REFERENCES invoices (id) ON DELETE CASCADE,
+  CONSTRAINT invoice_payment_methods_text_nonempty
+    CHECK (char_length(trim(text)) > 0)
+);
+
+CREATE INDEX idx_invoice_payment_methods_invoice_id
+  ON invoice_payment_methods (invoice_id, sort_order);
+
+CREATE TRIGGER invoice_payment_methods_set_updated_at
+  BEFORE UPDATE ON invoice_payment_methods
+  FOR EACH ROW
+  EXECUTE FUNCTION set_updated_at();